"The Mirror" is a magical Gem-powered item that first appears in the episode "Mirror Gem". Steven is given the mirror by the Crystal Gems to learn about gem history and later discovers that a Gem, Lapis Lazuli, is trapped within it.
An ornate design of silver-blue metallic material comprises the backing and handle of the mirror; while Lapis' cracked gemstone is affixed to the back. The mirror itself is a round piece of blue reflective glass with a faint contour of a gemstone etched on its surface.
Pearl gives the mirror to Steven so he can learn about the Gem's culture and history; it is able to show its viewer any event it was present for since its creation. Pearl tells Steven they found the item at the Galaxy Warp. As Steven and Lapis begin communicating, she tells him she was purposely imprisoned within the mirror and eventually gets Steven to release her from it by having him remove her gemstone from the back, shattering the mirror as a result. The Gem's potential prior connection with Lapis and the mirror is currently unknown.